The information does vary from person to person. I have said in a previous post that quite a few years of my late husbands service were omitted from his records, several postings and medal details were missing. It was surprising as only left the Army in the 1980's, but I was assured they had nothing else on him.
Fortunately, having accompanied him on the missing postings, I was able to fill in the missing information myself, so my son now has the complete information.
Jebber